30CrMo steel with high strength and toughness, high hardenability, quenching in the oil critical diameter of 15 ~ 70mm; steel thermal strength is better, below 500 ℃ with sufficient high temperature strength, but 550 ℃ when its The strength is decreased significantly; when the 30CrMo alloy elements in the lower limit of welding is quite good, but close to the upper limit of welding medium, and to be preheated to more than 175 ℃; 30CrMo steel can be machinable, cold deformation of plastic medium; In the heat treatment, there is a first type of temper brittleness in the range of 300 to 350 ° C.
30CrMo Chemical composition:
C：0.26～0.34
Si：0.17～0.37
Mn：0.40～0.70
Cr：0.80～1.10
Mo：0.15～0.25
P：≤0.035
S：≤0.035
Ni：≤0.030
Cu：≤0.030
30CrMo Heat treatment [Sample blank size (mm): 25]:
The first quenching heating temperature (℃): 880; Coolant: water, oil
Second quenching heating temperature (℃): -
Tempering heating temperature (℃): 540; Coolant: water, oil
Tensile strength (σb / MPa): ≥930
Yield point (σs / MPa): ≥785
Elongation at break (δ5 /%): ≥12
Section shrinkage (ψ /%): ≥50
Impact absorption work (Aku2 / J): ≥63
Brinell hardness (HBS100 / 3000) (annealing or high temperature tempering state) ≤ 229
30CrMo Applications:
30CrMo steel is usually used in the quenched and tempered state, when the lower limit of carbon content of steel can also be used as the requirements of the heart strength of the higher carburizing steel.
30CrMo in the medium-sized machinery manufacturing industry is mainly used in the manufacture of large cross-section, high stress conditions in the work of quenched and tempered parts, such as shaft, spindle and by high-load steering wheel, bolts, studs,
30CrMo used in the chemical industry in the manufacture of welded parts, sheet metal and pipe welded structure and work in the presence of nitrogen and hydrogen medium temperature does not exceed 250 ℃ high-pressure catheter;
30CrMo in the steam turbine, boiler manufacturing industry for the manufacture of 450 ℃ the following fasteners,? 500 ℃ by the following high-pressure flange and nut, especially suitable for the manufacture of 300 atmospheres, 400 ℃ below the work of the catheter.
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